Vuejs State Management Patterns Quiz

1. What is state management in Vue.js?

• State management is about localizing component data within each instance.
• State management is a design pattern for handling application state centrally.
• State management focuses solely on rendering UI elements without data flow.
• State management refers to creating multiple instances for each component.

2. Why is state management important in Vue.js?

• It simplifies the syntax of Vue components.
• It enhances the performance of Vue.js rendering.
• It helps structure the application and ensure data consistency.
• It automatically manages user authentication processes.

3. What are some common state management patterns in Vue.js?

• Immutable data
• Reactive programming
• Context API
• Global store

4. What is the simplest form of state management in Vue.js?

• Event bus approach
• Using props and events
• Vuex global store
• Reactive state object

5. What is an event bus in Vue.js?

• An event bus is a Vue instance used for communication between unrelated components.
• An event bus is a method for routing components in Vue.js.
• An event bus is a library for state management in Vue.js.
• An event bus is a tool for compiling Vue templates.

6. What is a global store in Vue.js?

• A component that renders global settings.
• An object that holds the application state.
• A method for inter-component communication.
• A function for local component data.

7. What is Vuex and how does it integrate with Vue.js?

• Vuex is a router library for Vue.js that manages page navigation and routing.
• Vuex is the official state management library for Vue.js, providing a centralized store for managing the state of your application and integrating well with Vue`s core features.
• Vuex is a helper library for debugging Vue.js components during development.
• Vuex is a CSS framework that styles Vue.js applications and enhances layouts.

8. How do you set up Vuex in a Vue.js application?

• Vuex is set up by manually managing state across components without installation.
• Install Vuex using `npm install vue` and link it in your HTML file directly.
• You need to create a Vue instance and include Vuex in the component`s script section.
• To set up Vuex, you need to install it as a dependency using `npm install vuex`, then create and import the store in your main.js file.

9. What is the basic structure of a Vuex store?

• The basic structure of a Vuex store involves pages, views, plugins, and helpers.
• The basic structure of a Vuex store consists of files, routes, components, and layouts.
• The basic structure of a Vuex store includes the state object, mutations, actions, and getters.
• The basic structure of a Vuex store encompasses styles, themes, templates, and scripts.

10. How do you access the state in a Vuex store?

• this.$store.state
• this.getStateFromStore()
• this.store.access()
• store.state.get()

11. How do you commit mutations in a Vuex store?

• this.commit(`mutation_name`)
• this.$store.commit(`mutation_name`)
• this.$store.send(`mutation_name`)
• store.commit(`mutation_name`)

12. What is the difference between mutations and actions in Vuex?

• Mutations change state synchronously, actions handle async processing.
• Actions are only for synchronous tasks, mutations are always async.
• Actions change state directly, mutations handle async calls.
• Mutations are for server communication, actions for UI updates.

13. How do you modularize a Vuex store?

• Use local storage for state
• Break it into smaller modules
• Combine all components together
• Remove state management entirely

14. What is the purpose of using actions in Vuex?

• Actions handle asynchronous operations like API requests, ensuring that complex logic is kept separate from mutations.
• Actions manage the lifecycle hooks and events in components, maintaining their states.
• Actions are used for rendering components, managing the view layer effectively.
• Actions primarily handle synchronous operations, directly modifying the state without delay.

15. How do you persist state with Vuex?

• Save state in a global variable
• Use props to pass state around
• Use the vuex-persistedstate plugin
• Store state in Vue component data

16. What are some best practices for managing local state in Vue.js?

• Keeping local state as local as possible
• Storing all state in global variables
• Using one massive component for all state
• Avoiding the use of computed properties

17. What are some best practices for using Vuex?

• Use only local state for every component
• Combine all state management in a single file
• Avoid using Vuex for complex applications
• Keep the store clean, use actions for async logic, modularize the store

18. How does Vuex handle state changes?

• Vuex handles state changes using events that trigger reactivity throughout the application.
• Vuex processes state changes by creating duplicate state objects in each component to avoid conflicts.
• Vuex manages state changes through direct manipulation of component data without any defined methods.
• Vuex handles state changes through mutations, which are functions that update the state object in a predictable way.

19. What is the role of reactive in defining a state object in Vuex?

• Reactive initializes the store but does not affect state management in Vuex.
• Reactive allows only synchronous state changes, disregarding component reactivity.
• Reactive is used to define a reactive state from a JavaScript object, ensuring that all components referring to this state re-render when it changes.
• Reactive defines a static state, maintaining data irrespective of changes.

20. How do you handle conditional directives in Vue.js?

• Conditional directives can only be handled with manual JavaScript code.
• Conditional directives in Vue.js include `v-if`, `v-else`, `v-else-if`, and `v-show`.
• Only `v-bind` can be used to change element visibility in Vue.js.
• Vue.js does not support conditional rendering in templates.

21. What is the difference between v-if and v-show directives?

• `v-if` hides the element; `v-show` shows the element.
• `v-if` is for animations; `v-show` is for static content.
• `v-if` adds/removes DOM elements; `v-show` toggles visibility.
• `v-if` toggles visibility; `v-show` adds/removes DOM elements.

22. How do you use v-for directive in Vue.js?

• The `v-for` directive is used to toggle visibility of elements based on conditions.
• The `v-for` directive is used to render a list of items based on an array or object, allowing you to iterate over the items and display them in the template.
• The `v-for` directive is used to bind CSS classes conditionally to an element.
• The `v-for` directive is used to handle user events in Vue.js.

23. What is the purpose of using event handlers in Vue.js?

• Event handlers load external resources.
• Event handlers provide routing functionality.
• Event handlers manage user interactions.
• Event handlers display static content.

24. How do you use event handlers with the v-on directive in Vue.js?

• You use event handlers directly within the methods section of your Vue component.
• You use event handlers with the `v-on` directive by attaching methods to it, like `v-on:click=`methodName“.
• You bind event handlers by using a `data` property and referencing it in the template.
• You attach event handlers by using the `on` directive with an HTML tag.

25. What is the role of the $event variable in event handlers?

• The `$event` variable monitors state changes in Vuex stores.
• The `$event` variable provides access to the native event object within an event handler method.
• The `$event` variable is used exclusively for component lifecycle hooks.
• The `$event` variable stores user input from form elements.

26. How do you handle query parameters in Vue.js?

• You access query parameters through `this.queryParams` in the Vue instance.
• You can access query parameters using the `$route.query` object in your Vue components.
• You manage query parameters with the `data()` function in Vue components.
• You handle query parameters using a method called `getQueryParams`.

27. What is the basic logical organization of a Vue.js application?

• Write all components in one file
• Create a new Vue instance with options
• Use only single file components
• Initialize Vuex automatically

28. How do you use single file components (SFCs) in Vue.js?

• Single file components (SFCs) are self-contained files combining template, script, and style.
• Single file components (SFCs) are used to define global routing in Vue.js.
• Single file components (SFCs) are only HTML files for templates.
• Single file components (SFCs) contain only the script section of Vue components.

29. What are some common directives used in Vue.js?

• v-once
• v-forEach
• v-if
• v-bind

30. How do you use the v-model directive in Vue.js?

• The `v-model` directive sets a fixed value for an element.
• The `v-model` directive is used for conditional rendering of components.
• The `v-model` directive is exclusively for handling events in Vue.js.
• The `v-model` directive binds an input value to a data property.